1What: /sys/devices/cpu/events/ 2 /sys/devices/cpu/events/branch-misses 3 /sys/devices/cpu/events/cache-references 4 /sys/devices/cpu/events/cache-misses 5 /sys/devices/cpu/events/stalled-cycles-frontend 6 /sys/devices/cpu/events/branch-instructions 7 /sys/devices/cpu/events/stalled-cycles-backend 8 /sys/devices/cpu/events/instructions 9 /sys/devices/cpu/events/cpu-cycles 10 11Date: 2013/01/08 12 13Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> 14 15Description: Generic performance monitoring events 16 17 A collection of performance monitoring events that may be 18 supported by many/most CPUs. These events can be monitored 19 using the 'perf(1)' tool. 20 21 The contents of each file would look like: 22 23 event=0xNNNN 24 25 where 'N' is a hex digit and the number '0xNNNN' shows the 26 "raw code" for the perf event identified by the file's 27 "basename". 28 29 30What: /sys/bus/event_source/devices/<pmu>/events/<event> 31Date: 2014/02/24 32Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> 33Description: Per-pmu performance monitoring events specific to the running system 34 35 Each file (except for some of those with a '.' in them, '.unit' 36 and '.scale') in the 'events' directory describes a single 37 performance monitoring event supported by the <pmu>. The name 38 of the file is the name of the event. 39 40 File contents: 41 42 <term>[=<value>][,<term>[=<value>]]... 43 44 Where <term> is one of the terms listed under 45 /sys/bus/event_source/devices/<pmu>/format/ and <value> is 46 a number is base-16 format with a '0x' prefix (lowercase only). 47 If a <term> is specified alone (without an assigned value), it 48 is implied that 0x1 is assigned to that <term>. 49 50 Examples (each of these lines would be in a seperate file): 51 52 event=0x2abc 53 event=0x423,inv,cmask=0x3 54 domain=0x1,offset=0x8,starting_index=0xffff 55 56 Each of the assignments indicates a value to be assigned to a 57 particular set of bits (as defined by the format file 58 corresponding to the <term>) in the perf_event structure passed 59 to the perf_open syscall. 60 61What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit 62Date: 2014/02/24 63Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> 64Description: Perf event units 65 66 A string specifying the English plural numerical unit that <event> 67 (once multiplied by <event>.scale) represents. 68 69 Example: 70 71 Joules 72 73What: /sys/bus/event_source/devices/<pmu>/events/<event>.scale 74Date: 2014/02/24 75Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> 76Description: Perf event scaling factors 77 78 A string representing a floating point value expressed in 79 scientific notation to be multiplied by the event count 80 recieved from the kernel to match the unit specified in the 81 <event>.unit file. 82 83 Example: 84 85 2.3283064365386962890625e-10 86 87 This is provided to avoid performing floating point arithmetic 88 in the kernel. 89